Maybe the spawns are out too far??? I would try moving them in a bit closer and see if that helps. Also...sims cannot route through those pylons so the spawns near those are not accessible. You may notice, when looking at your routing data, a red square around that object. That's it's footprint and every object has one. No sim can walk through it. Perhaps, too, there is not enough room in front of that lot to access that one spawn. I don't recall if sims can fish while standing IN the water?
Example: notice there is no blue routing paint but it's blocked off.
https://imgur.com/a/DL0CXBn
(FYI - the game automatically rebuilds the data when you save, you don't have to manually do it ; )